Will a 2004, 2500, 4x4, 8' bed, interchange with a 2003, 1500, 2x4, extended cab, 8' bed? Thanks.

Best way to find out is pull a tape and check the dimensions and check the bolt up distances. If they match up you should be OK. But I don't have a yes or no answer for you. Good luck.
Trevor - Huntington Beach, CA
2007 GMC 2500 4X4
99 to 2006 are the same bed. Google.com works good for ? like that.
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